A Spectral Approach to the Dynamic Instability Analysis in Earthquake Resistant Design

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The design of a structure for earthquake resistance includes consideration of the interaction between gravity loads and lateral displacements. This interaction, known as the P-Delta effect, refers to a tendency for unidirectional yielding of the structure, which can lead to dynamic instability and collapse of the structure. A methodology to consider P-Delta effects in the design of seismic resistant structures is lacking. The objective of this research is to develop such a methodology to consider the P-Delta effect and dynamic instability. The approach is based on the definition of the inelastic spectrum. The premise is that P-Delta effects can be included through spectrum modification, in a way that is similar to the methods used to incorporate the effects of ductility and damping.